<!-- navbar中的tag标签 -->
<template>
	<el-breadcrumb class="app-breadcrumb" separator="/" :separator-icon="ArrowRight">
		<transition-group name="breadcrumb">
			<el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
				<!-- 当前tag -->
				<span v-if="item.redirect === 'noRedirect' || index == levelList.length - 1" class="no-redirect">
					{{ item.meta.title }}
				</span>
				<!-- 历史tag -->
				<!-- <a v-else @click.prevent="handleLink(item)" class="histag">{{ item.meta.title }}</a> -->
				<span v-else class="histag">{{ item.meta.title }}</span>
			</el-breadcrumb-item>
		</transition-group>
	</el-breadcrumb>
</template>

<script setup>
import { ArrowRight } from '@element-plus/icons-vue'
const route = useRoute()
const router = useRouter()
const levelList = ref([])

function getBreadcrumb() {
	// only show routes with meta.title
	let matched = route.matched.filter((item) => item.meta && item.meta.title)
	const first = matched[0]
	// 判断是否为首页
	if (!isDashboard(first)) {
		matched = [{ path: '/index', meta: { title: '首页' } }].concat(matched)
	}

	levelList.value = matched.filter((item) => item.meta && item.meta.title && item.meta.breadcrumb !== false)
}
function isDashboard(route) {
	const name = route && route.name
	if (!name) {
		return false
	}
	return name.trim() === 'Index'
}
function handleLink(item) {
	const { redirect, path } = item
	if (redirect) {
		router.push(redirect)
		return
	}
	router.push(path)
}

watchEffect(() => {
	// if you go to the redirect page, do not update the breadcrumbs
	if (route.path.startsWith('/redirect/')) {
		return
	}
	getBreadcrumb()
})
getBreadcrumb()
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
	display: inline-block;
	font-size: 14px;
	line-height: 50px;
	margin-left: 8px;

	.no-redirect {
		color: #ffff;
		cursor: text;
	}
	.histag {
		color: #dddd;
	}
}
::v-deep(.el-breadcrumb__separator) {
	color: #fff;
}
</style>
